ETH sucks. It does not scale, and never will (even with PoS). It also is wasteful AF. "ETH supercomputer" is just lots of computers doing as many FLOPs as a 2008 flip-phone.
I never fully understood PoS. I get how it works but I don't understand how it helps determine which of 2 chains is "longer". With PoW you can see the work. With PoS can't I fake it?